27a³...

July 2022 1 35 Report

представьте в виде многочлена: (-2/3 а+1 1/2b)³.

1)27/8b³+9/2ab²+a²b+8/27a³

2)27/8b³-9/2ab²+2a²b-8/27a³

3)27/8b³-9/2ab²-2a²b+8/27a³

4)27/8b³-9/2ab²+a²b-8/27a³

Answers & Comments

Shahriyor30

Ответ:

Правильный ответ (2)

Объяснение:

$( - \frac{2}{3} a + 1 \frac{1}{2} b) {}^{3} = ( \frac{3}{2} b - \frac{2}{3} a) {}^{3} = \frac{27}{8} b {}^{3} - 3 \times ( \frac{3}{2} b) {}^{2} \times \frac{2}{3}a + 3 \times \frac{3}{2} b \times (\frac{2}{3}a ) {}^{2} - \frac{8}{27} a {}^{3} = \frac{27}{8} b {}^{3} - \frac{9}{2} ab {}^{2} + 2a {}^{2} b - \frac{8}{27} a {}^{3}$

2 votes Thanks 1

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